#  pI = 8.46
#  pH      chg
 0.00	  1.00
  0.50	  1.00
  1.00	  1.00
  1.50	  1.00
  2.00	  1.00
  2.50	  1.00
  3.00	  1.00
  3.50	  1.00
  4.00	  1.00
  4.50	  1.00
  5.00	  1.00
  5.50	  1.00
  6.00	  0.99
  6.50	  0.97
  7.00	  0.90
  7.50	  0.73
  8.00	  0.40
  8.50	 -0.04
  9.00	 -0.56
  9.50	 -1.13
 10.00	 -1.60
 10.50	 -1.85
 11.00	 -1.97
 11.50	 -2.04
 12.00	 -2.16
 12.50	 -2.42
 13.00	 -2.82
 13.50	 -3.28
 14.00	 -3.65